evp_key.c

/* crypto/evp/evp_key.c *//* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */#include <stdio.h>#include "cryptlib.h"#include <openssl/x509.h>#include <openssl/objects.h>#include <openssl/evp.h>#include <openssl/ui.h>/* should be init to zeros. */staticchar prompt_string[80];
void EVP_set_pw_prompt(constchar *prompt)
{
if (prompt == NULL)
prompt_string[0]='\0';
else
{
strncpy(prompt_string,prompt,79);
prompt_string[79]='\0';
}
}
char *EVP_get_pw_prompt(void)
{
if (prompt_string[0] == '\0')
return(NULL);
elsereturn(prompt_string);
}
/* For historical reasons, the standard function for reading passwords is * in the DES library -- if someone ever wants to disable DES, * this function will fail */int EVP_read_pw_string(char *buf, int len, constchar *prompt, int verify)
{
int ret;
char buff[BUFSIZ];
UI *ui;
if ((prompt == NULL) && (prompt_string[0] != '\0'))
prompt=prompt_string;
ui = UI_new();
UI_add_input_string(ui,prompt,0,buf,0,(len>=BUFSIZ)?BUFSIZ-1:len);
if (verify)
UI_add_verify_string(ui,prompt,0,
buff,0,(len>=BUFSIZ)?BUFSIZ-1:len,buf);
ret = UI_process(ui);
UI_free(ui);
OPENSSL_cleanse(buff,BUFSIZ);
return ret;
}
int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
constunsignedchar *salt, constunsignedchar *data, int datal,
int count, unsignedchar *key, unsignedchar *iv)
{
EVP_MD_CTX c;
unsignedchar md_buf[EVP_MAX_MD_SIZE];
int niv,nkey,addmd=0;
unsignedint mds=0,i;
nkey=type->key_len;
niv=type->iv_len;
OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH);
OPENSSL_assert(niv <= EVP_MAX_IV_LENGTH);
if (data == NULL) return(nkey);
EVP_MD_CTX_init(&c);
for (;;)
{
if (!EVP_DigestInit_ex(&c,md, NULL))
return 0;
if (addmd++)
EVP_DigestUpdate(&c,&(md_buf[0]),mds);
EVP_DigestUpdate(&c,data,datal);
if (salt != NULL)
EVP_DigestUpdate(&c,salt,PKCS5_SALT_LEN);
EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds);
for (i=1; i<(unsigned int)count; i++)
{
EVP_DigestInit_ex(&c,md, NULL);
EVP_DigestUpdate(&c,&(md_buf[0]),mds);
EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds);
}
i=0;
if (nkey)
{
for (;;)
{
if (nkey == 0) break;
if (i == mds) break;
if (key != NULL)
*(key++)=md_buf[i];
nkey--;
i++;
}
}
if (niv && (i != mds))
{
for (;;)
{
if (niv == 0) break;
if (i == mds) break;
if (iv != NULL)
*(iv++)=md_buf[i];
niv--;
i++;
}
}
if ((nkey == 0) && (niv == 0)) break;
}
EVP_MD_CTX_cleanup(&c);
OPENSSL_cleanse(&(md_buf[0]),EVP_MAX_MD_SIZE);
return(type->key_len);
}